A train has a rest length of 100 m. Traveling at a very high velocity, it goes through a tunnel of length 80 m. Observers located at both ends of the tunnel note that at one instant the train appears to exactly fit within the tunnel. What is the velocity of the train expressed in units of c?
A. 0.333c
B. 0.60c
C. 0.80c
D. 0.50c
E. 0.866c
Answer: B
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